使用jQuery的同步滚动? [英] Synchronized scrolling using jQuery?
问题描述
我试图用下面的代码实现两个 DIV
的同步滚动。
I am trying to implement synchronized scrolling for two DIV
with the following code.
$(document).ready(function() {
$("#div1").scroll(function () {
$("#div2").scrollTop($("#div1").scrollTop());
});
$("#div2").scroll(function () {
$("#div1").scrollTop($("#div2").scrollTop());
});
});
#div1
和#div2
具有相同的内容,但大小不同,例如
#div1
and #div2
is having the very same content but different sizes, say
#div1 {
height : 800px;
width: 600px;
}
#div1 {
height : 400px;
width: 200px;
}
使用此代码,我面临两个问题。
With this code, I am facing two issues.
1)滚动不同步,因为div是不同的大小。我知道,这是因为,我直接设置 scrollTop
值。我需要找到滚动内容的百分比,并为其他 div
计算相应的 scrollTop
值。我不知道,如何找到实际的高度和当前的滚动位置。
1) Scrolling is not well synchronized, since the divs are of different sizes. I know, this is because, I am directly setting the scrollTop
value. I need to find the percentage of scrolled content and calculate corresponding scrollTop
value for the other div
. I am not sure, how to find the actual height and current scroll position.
2)这个问题只能在 firefox
。在Firefox中,滚动不像在其他浏览器中那样流畅。我认为这是因为上面的代码是创建一个无限循环的滚动事件。
我不知道,为什么这只是发生在firefox。有任何方法可以找到滚动事件的来源,所以我可以解决这个问题。
2) This issue is only found in firefox
. In firefox, scrolling is not smooth as in other browsers. I think this because the above code is creating a infinite loop of scroll events.
I am not sure, why this is only happening with firefox. Is there any way to find the source of scroll event, so that I can resolve this issue.
任何帮助将非常感激。
推荐答案
您可以使用 element.scrollTop /(element.scrollHeight - element.offsetHeight)
(它将是 0
和 1
之间的值)。因此,您可以将其他元素的(。scrollHeight --.offsetHeight)
乘以此值进行比例滚动。
You can use element.scrollTop / (element.scrollHeight - element.offsetHeight)
to get the percentage (it'll be a value between 0
and 1
). So you can multiply the other element's (.scrollHeight - .offsetHeight)
by this value for proportional scrolling.
避免在循环中触发侦听器,您可以临时解除绑定侦听器,设置 scrollTop
并重新重新绑定。
To avoid triggering the listeners in a loop you could temporarily unbind the listener, set the scrollTop
and rebind again.
var $divs = $('#div1, #div2');
var sync = function(e){
var $other = $divs.not(this).off('scroll'), other = $other.get(0);
var percentage = this.scrollTop / (this.scrollHeight - this.offsetHeight);
other.scrollTop = percentage * (other.scrollHeight - other.offsetHeight);
// Firefox workaround. Rebinding without delay isn't enough.
setTimeout( function(){ $other.on('scroll', sync ); },10);
}
$divs.on( 'scroll', sync);
http://jsfiddle.net/b75KZ/5/
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